https://www.amazon.com/IronBox-Electric-Connector-Power-Cord...

https://www.amazon.com/14-50P-6-15R-Adapter-Adaptor-Charger/...

The C14 connector used on power supplies are designed to be able to take 240VAC input. You just need the right adapters to be able to plug it into NEMA 14-50R.

That said, usually the way people do things is that they have a power distribution unit that provides C14 receptacles and plugs into a high power outlet like this:

https://www.apc.com/us/en/product/APDU9981EU3/apc-rack-pdu-9...

Then they plug multiple power supplies into it. It makes more sense than having a single high power, power supply unit. A problem with scaling PSUs is that the C13/C14 connectors they use have a maximum current rating of 10A. That limits peak power draw to 2200W due to countries whose power grids operate at 220V. Thus you will not find many ATX PSUs higher rated than this:

https://seasonic.com/atx3-prime-px-2200/

They could switch to another connector for higher current, but there is no standard IEC connector for 50A (40A continuous) as you wanted as far as I know. The highest is C19/C20 for 16A.